Model 34800/34801/AC900 Refrigerant Management Center CFC
Contents
1. INSTO542 26 System Oil Seperator 28 34724 Spin on Filter Drier 48 RA17459 RA19562 220v System Relay 29 RA19458 RA19457 220v Compressor 52 RA17416 RA17516 220 volt Fan 30 Compressor Oil Seperator 53 RA19545 Manifold Block 31 RA19258 Equalization Oil Return Solenoid 54 RA19561 RA19562 Mac Tools Keypad 35 RA19477 RA19616 220v R 134a Air Purge Device 111043 Replacement Start Capcitor 36 RA19476 RA19623 220 Volt R 12 Air Purge Device 39 120034 Oil Injector Assembly 34800 34801 Service Manual ORIGINAL 5 99 Manifold Block Flow Diagram MANIFOLD ON CONTROL PANEL FROM LIQUID PORT ON TANK MP ORIGINAL 5 99 34800 34801 Service Manual Wiring Diagram 34800 34801 amp AC900 INSTO563 10 34800 34801 Service Manual ORIGINAL 5 99 Main Circuit Board Diagram LOL WOOL UU INST 0518 ORIGINAL 5 99 34800 34801 Service Manual Plumbing Schematic OIL INJECTOR 0 BOTTOM CONNECTION ON ACCUMULATOR Co TO BOTTO2. W Ree EE 22 ROBINAIR RUE eS ea Mes Tet Ree ee NET wae a SEE E TOOLS Service M anual Model 34800 34801 AC900 Refrigerant Management Center CFC 12 HFC 134a Recycling Equipment Theory of Operation and Safety Precautions 0 eee eeeeeeee 2 Component Descriptions ss 3 Flow Diagram Components 6 BOW Diagramme EES ee 7 Pictorial View Front mine mutants 8 Manifold Block Flow Diagram uci eee cece ceeeeeeeeeeeeeeeneeeeeene 9 Mining Pia BAM EE 10 Main Board Diagram cceeceesecesnceseeceseeceeeecsseeeneeceeeeceeeeneeeees 11 Plumbing Schematic 12 Display D finitions ssse nent erritoen iTos Tipas 13 Control Panel Components 20 00 00 ce cee ceceseeeeceeeeeeeeseeeneeseeeneenaes 13 Relay Specifications ra Minnie 14 Relay Troubleshooting 4 14 Component Specifications 00 0 cesecseceecneceseeeeceseeeeeeseeeeeeaes 15 Compressor Specifications and Service 16 TroubleshooOtin EE 17 Diagnostic Procedures 0 eeeesscssncecseceececeseceseeceseecaeceneecsseeeneecsees 24 RA19210 Scale Accuracy Check and Recalibration 00 25 Checking the Scale Accuracy oc eeeeeeeceeeceeeeeeeeeeeeeeeneeeeeeneeeaee 25 Recalibrating the Scale eeeseeesseesseeesesessesersrerrsresrssesrrsreserrrsreees 25 Setting the Pl Pot iAudio 25 Diagnostic Proced rteS isei
3. Sends a signal to the main board for accurate weight readings and tank overfill protection RA17459 RA17324 220 volt System Relay Energizes the compressors and vacuum pump allowing the sensors to turn off the unit The relay has two sets of contacts which close when the coil is energized RA19404 Casters e 113540 Caster Screws 7 required 109525 Caster Nuts 7 required RA19405 Wheels e 102755 Wheel Washers 6 required 100723 Cotter Pin 2 required 112776 Fuse Holder RA17416 RA17516 220V Fan Receives power when main power is turned on Cools internal unit components RA19545 Manifold Block Contains recovery recycle recharge and equalization solenoids Also located on the block are the Hi P sensor vacuum sensor vacuum pump protection switch expansion valve filter oil and compressor oil separator 53 54 Keypad RA19561 RA19562 AC900 Overlay which contains electronic keypad All inputs go directly to circuit board via the ribbon If a keypad is bad all four keys in one row or one column will not respond RA19282 Discharge Check Valve Allows flow in one direction only and prevents refrigerant and pressure from the tank from being equalized back into the low side of the unit when the equalization solenoid opens to return compressor oil and repressurize the system oil separator ORIGINAL 5 99 34800 34801 Service Manual 10 11 12 13 14 15 F
4. Enter the deep diagnostic mode by pressing 9 when the FUNC message displays Four dashed lines appear on the display Press 3 on the keypad The display shows 000 The zero on the left is for R 12 The zero on the right is for R 134a Since this machine uses 301b tanks the full limit should be set at 43 Ibs When 43 lbs is placed on the R 12 scale the zero on the left should change to a number one 1 When the zero changes to a one you have reached the full limit on the R 12 scale Remove a small amount of weight from the scale and watch for the number one to change back to zero Repeat this process on the R 134a scale The only difference is that the zero on the right of the display indicates whenther or not you have reached the full limit on the R 134a scale This change is indicated by the change from zero to the one then back to zero again DIAGNOSTIC STEP TEST Push Shift Reset and Enter at the same time Then push 9 Then push 5 Push 6 and 9 at the same time 01 R 134a Recycle Solenoid 09 R 12 Recover Solenoid 02 R 134a Recover Solenoid 10 R 12 Vacuum Solenoid 03 R 134a Vacuum Solenoid 11 R 12 Charge Solenoid 04 R 134a Charge Solenoid 12 R 12 Air Purge Solenoid 05 R 134a Air Purge Solenoid 13 R 12 Compressor Relay 06 R 134a Compressor Relay 14 Vacuum Pump Relay 07 R 134a Equalization Solenoid 15 R 12 Equalization Solenoid 08 R 12 Recycle Solenoid 28 34800 34801 Service Manual ORIGINAL 5 99 Function Test RECOVERY C
5. 13 Hg test the vacuum sensor for continuity If the vacuum sensor has continuity replace it If it does not check the vacuum sensor wires for continuity If the wires have continuity replace the main board If there is no positive pressure verify that the inlet check valve is operating properly Also verify that the recovery solenoid is opening and allowing flow Repair and replace as necessary 18 34800 34801 Service Manual ORIGINAL 5 99 Troubleshooting UNIT WILL NOT START OR COMPLETE Display Reads CH P RECOVERY continued 1 If there is less than 25 psi at the inlet attempt recovering from a positive pressure source 2 Verify that the wires that control the vacuum pump protection switch have continuity 3 If there is more than 25 psi at the inlet verify no obstructions in the manifold valves Then replace the vacuum pump protection switch 4 If the sensor is operating properly press CONT to override 5 If the main board will not let you override verify that the keypad is sending the signal If it is replace the main board If it is not sending a signal replace the keypad Display Reads CHE 1 The filter change time has elapsed To reset the timer refer to the operating manual for the filter change procedure 2 If after attempting to reset the timer the CH F warning does not disappear replace the main board Display Reads 15 00 Vacuum Program Minutes 1 If the displa
6. 2 hrs to get the default The third digit represents the default filter weight and is multiplied by 50 lbs to get the default This code can be changed by using the UP and DOWN arrow keys The ENTER key locks in the new code and resets the unit with the new settings Not used 24 34800 34801 Service Manual ORIGINAL 5 99 Scale Accuracy Check and Recalibration for AC900 CHECKING THE SCALE ACCURACY 1 Turn on the MAIN POWER switch 2 Press the MODE key until the program prompt is highlighted on the screen 3 When the screen has the program prompt highlighted press the MODE and ENTER keys simultaneously to enter the DIAGNOSTIC mode 4 Remove all weight from both scale platforms 5 Using the UP and DOWN keys toggle the display to read F06 6 Press the ENTER key to turn the scale into a direct reading weight scale NOTE Whatever weight is on the scale when ENTER is pressed will not be shown on the display Be pressing ENTER the unit automatically zeros the weight on the scale of the selected regfrigerant type If you remove the weight the display shows the change in total weight but does not show a negative sign The refrigerant selector switch may be changed during the procedure to check both scales If the scales does not react to testing verify that the scales are plugged into the main board RECALIBRATING THE SCALES 1 Remove all weight from the scale platform 2 Turn on the main power swit
7. RA19402 MacTools R 134a High Side Gauge Reads pressure entering the high side hose RA19392 RA19403 MacTools R 134a Low Side Gauge Reads pressure entering the low side hose RA 19393 RA19400 MacTools R 12 High Side Gauge Reads pressure entering the high side hose RA19392 RA19401 MacTools R 12 Low Side Gauge Reads pressure entering the low side hose 121238 Low and High Side Manifold Valve R 134a Assembly Allows refrigerant flow from the high and low side hoses to the center manifold port 121239 Low and High Side Manifold Valve R 12 Assembly Allows refrigerant flow from the high and low side hoses to the center manifold port RA19429 Vacuum Pump Protection Switch A normally open sensor that closes when pressure greater than 25 psi is present in the A C system If the pressure is less than 25 psi in the recovery mode the display reads CH P In the vacuum mode the display reads U HI if the pressure is 25 psi or greater in the A C system This indicates that a recovery procedure must be performed before attempting a vacuum RA18752 Vacuum Sensor A normally closed sensor that sends a signal to the main board when a 13 Hg vacuum has been reached on the inlet line RA19258 Recovery Solenoid Rebuild Kit A normally closed solenoid designed to prevent the flow of refrigerant into the system oil separator while the unit is off or in any mode ot
8. Red Quick Seal Hose High side service hose to the vehicle e 18180 Replacement R 12 Quick Seal O ring e 18451 45 14 Flare Quick Seal Repair Kit 68126 36 Red R 134a Tank Hose Delivers refrigerant being recovered or recycled to the vapor side of the R 134a storage tank e 17773 Replacement R 134a Quick Seal O ring e 40302 R 134a Quick Seal Repair Kit 68127 36 Blue R 134a Tank Hose Allows flow from the liquid side of the R 134a tank to the recycling and charging solenoids e 17773 Replacement R 134a Quick Seal O ring e 40302 R 134a Quick Seal Repair Kit 68128 36 Yellow R 134a Tank Hose Supplies pressure from the top of the recovery tank to the air purge control e 17773 Replacement R 134a Quick Seal O ring e 40302 R 134a Quick Seal Repair Kit 68121A 36 Red R 12 Tank Hose Delivers refrigerant being recovered or recycled to the vapor side of the R 12 storage tank e 18180 Replacement R 12 Quick Seal O ring e 18451 45 14 Flare Quick Seal Repair Kit 11 68122A 36 Blue R 12 Tank Hose Allows flow from the liquid side of the R 12 tank to the recycling and charging solenoids e 18180 Replacement R 12 Quick Seal O ring e 18451 45 1 4 Flare Quick Seal Repair Kit 68123A 36 Yellow R 12 Tank Hose Supplies pressure from the top of the recovery tank to the air purge control e 18180 Replacement R 12 Quick Seal O ring e 18451 450 1 4 Flare Quick Seal Repair Kit RA19393
9. again resumes the operation Displays total accumulated filter weight Press the CHARGE and ENTER keys simultaneously to reset the counter to zero Displays date of last calibration and how many calibrations have been performed on the scales to a maximum of 225 Pressing CHARGE and ENTER simultaneously also returns this counter to zero This test lights all segments of the LCD for quick indication that the display rountines and circuitry are functioning properly 26 34800 34801 Service Manual ORIGINAL 5 99 Diagnostic Procedures 34800 and 34801 continued 6 Scale Calibration Check Display reflects any absolute weight change on the selected scale Upon entry to this mode the display briefly shows which refrigerant mode you are in then displays 0 00 If the refrigerant mode switch changes states the display repeats this indication for the selected side To zero the reading press 6 at any time This process is useful for adding weight to check positive response and then removing weight to check negative response Upon exit the weights will NOT be updated to reflect what was done to the scales 7 Refrigerant Weight Display indicates estimated refrigerant by weight in the selected tank This weight is obtained by the program by subtracting the coded tank weight from the total weight seen by the scale Because of this variation in tank weights this figure should only be used as an estimate The refrigerant mode switc
10. board 9 Check the low side gauge for proper operation and calibration UNIT WILL NOT EVACUATE U HI on Display PUMP IS OFF 1 Be sure pressure is present at the vacuum protection switch Recover before evacuation Unplug the switch 2 If U HI goes out check for pressure at the sensor If there is none replace the sensor 3 If U HI remains on replace the main board Timer Counting Down 1 Verify that the vacuum pump is plugged in 2 Check the voltage at the pump receptacle 3 If proper voltage is present be sure that the pump is not overfilled with oil If it is drain the pump Start and properly refill the pump If proper voltage is present replace the pump 4 If proper voltage is not present remove the shroud and look for loose wires 5 Check the voltage to the vacuum pump relay coil If there is no voltage check the wires between the vacuum pump relay and the main board for continuity If the wires are okay replace the main board If there is voltage at the vacuum pump relay coil replace the relay 6 Check for voltage from the 4 contact to ground If there is no voltage replay the relay 20 34800 34801 Service Manual ORIGINAL 5 99 Troubleshooting UNIT WILL NOT RECYCLE RECYCLE PROMPT IS OFF NO FLOW NOTE When the vacuum key is pressed the unit automatically recycles Recycle stops when the vacuum timer is down to three minutes When recycle stops the power is dropped to
11. expansion valve 10 If all previous attempts have failed replace the main board 21 ORIGINAL 5 99 34800 34801 Service Manual UNIT WILL NOT PERFORM AN AIR PURGE UNIT WILL NOT CHARGE NO PRESSURE ON GAUGES Troubleshooting NOTE The air purge only operates the first 10 minutes of recycling and then drops power to the air purge solenoid minimum of six pounds of refrigerant must be in the tank for the air purge to function properly LA BR Verify that the recovery tank has excess air pressure in it The only accurate way to do this is to connect a hand held manifold gauge set to the recovery tank s air purge fitting check the pressure in the tank and compare it with a temperature pressure chart If excess air pressure is confirmed verify that all recovery tank hoses are properly connected to the tank Slowly open the yellow hose where it attaches to the back of the unit If the tank is allowing access and the yellow hose is unobstructed pressure is released Repair and replace as necessary If the yellow hose has flow remove the front cover and verify that the exhaust port of the air purge device is not obstructed After recycling for at least three minutes verify that 110 220 volts is being sent to the air purge solenoid If it is not getting 110 220 volts inspect the control wires for continuity Repair or replace as necessary If the air purge solenoid is getti
12. psi If the pressure is high bleed the pressure down to 200 psi by recycling and allowing the automatic air purge to operate Check the red vapor tank hose for proper installation Be sure there is no obstruction at the tank fitting Check the 2 amp fuse on the back of the main board for continuity and replace if necessary If the replacement fuse blows check the compressor relay for shorted contacts Replace as necessary Check the wires between the high pressure cutout and the main board for continuity Repair or replace as necessary Replace the high pressure cutout and retest the unit Display Reads FULL 1 4 Check the tank weight and replace the tank if it is full Recalibrate the scale if necessary Adjustment of the P 1 pots see main board diagram for location may be necessary See Setting the P1 pot in the function test for detailed instructions Verify that the scale is connected properly Display Reads CPL 1 Verify that there is positive pressure on the unit s manifold gauges If there is no positive pressure connect to a vapor supply source and attempt recovery again Look for loose or broken wires in the unit Verify that the suction line strainer is not plugged See tubing schematic for location Install the low side hose coupler on the oil drain with the low side valve closed Open the oil drain valve Look for a psi reading If the pressure is below
13. CD Checks the scale accuracy Estimated weight of refrigerant in the selected tank is displayed Because tank weights vary this can only be considered an estimate Either tank can be selected in this mode by moving the mode switch between R 12 and R 134a When this mode is entered the display blanks Press RECOVER and RECYCLE ONLY keys simultaneously to continue The display counts up from 001 to 015 as corresponding outputs are cycled on and off this test can be accelerated at any time by pressing any key After the step test the display gives a code for any input that is not in its normal state as listed To continue when this occurs the input must be put into its normal state If all inputs are in their normal state the unit resumes normal operation r12 CH P R 12 Vacuum Protection Switch r12 CL L R 12 Low Pressure Switch 1134 CH P R 134a Vacuum Protection Switch r134a CL L R 134a Low Pressure Switch ref R 12 R 134a Mode Switch See RECALIBRATING THE SCALE for detailed instructions When this mode is entered the display blanks Press RECOVER and RECYCLE ONLY keys simultaneously to continue The display shows a three digit code that controls the default oil timer filter weight and vacuum time The default value for this code is 356 The first digit represents the default vacuum time and is multiplied by 5 minutes to get the default The second digit represents the vacuum pump oil timer and is multiplied by
14. Filter Gasket RA19458 RA19457 220 volt Compressor Converts low pressure low temperature incoming gas into high pressure high temperature discharge gas e 111043 Replacement Start Capacitor Compressor Oil Separator Traps compressor oil that has migrated out with refrigerant while passing through the compressor The oil is stored in the separator until the equalization solenoid loses power and allows the oil to be returned to the compressor e RA19480 Manifold O Ring Kit RA19258 RA17578 220 volt Equalization Solenoid A normally closed solenoid that allows oil trapped in the compressor oil separator to be forced back into the suction side of the compressor equalizing pressure on the high and low side of the compressor and pressurizing the system oil separator as power is applied to the solenoid Opens for 20 seconds after recovery is complete After the compressor has run for 10 continuous minutes the solenoid opens for three seconds 32 RA19427 High Pressure Cutout A normally closed sensor that shuts off the unit when the discharge pressure reaches 435 psi NOTE This switch has three contacts the outer two contacts numbered 1 and 3 are normally closed 33 34 RA19326 Recovery Check Valve Allows flow in one direction only and prevents refrigerant in the tank from coming back into the unit during shutdown RA19430 Automatic Expansion Valve Converts incoming liquid refrigerant into a lo
15. HECK Turn on the MAIN POWER switch Install the loose end of the low side hose coupler to the oil drain Close the low side manifold valve Open the high side manifold valve Verify that all tank hoses are properly attached to the recovery tank Completely open both tank valves Press RECOVER The compressor starts and the low side gauge pulls into a 13 Hg vacuum NOTE The unit s low side gauge pulls to a 13 Hg vacuum and starts the recovery process Recovery is engaged when the scale reading is displayed The low side gauge pulls to a 13 Hg vacuum again and the unit shuts off 8 10 11 When recovery is complete the display shows a scale weight then display the CPL message The low side manifold gauge builds positive pressure and a pressure transfer should be heard This is the result of the equalization solenoid opening and returning oil to the compressor If no pressure rise occurs the equalization solenoid and its tubing must be inspected for obstructions Disconnect the low side hose coupler from the service port and open the low side manifold valve Press RECOVER The unit recovers to 13 Hg of vacuum and shuts off EVACUATION amp RECYCLING CHECK NOTE The recovery tank must have at least 6 pounds of refrigerant in it to perform this test 1 2 9 10 12 13 14 15 16 Close the high side manifold valve Install the loose end of
16. M CONNECTION ON ACCUMULATOR ef J J P a VACUUM PUMP R INSTO655 Letter Qty Description A 120225 2 Hose 1 4 O D B 120887 2 Hose Assembly C 121188 1 Air Purge Inlet Tube D 120165 2 Tubing 3 8 O D 22 0 E 121311 1 Pneumatic Connector 3 8 Tee F 121195 1 Air Purge Inlet Tube G 121189 1 Liquid Inlet Tube H 121196 1 Liquid Inlet Tube I 121191 2 Block Inlet Tube Refrigerant J 121185 1 Compressor Discharge Line K 121186 1 Compressor Return Oil Line L 121187 1 Compressor Suction Line M 121192 1 Compressor Discharge Line N 121193 1 Compressor Return Oil Line O 121194 1 Compressor Suction Line P 120165 1 Tubing 3 8 O D 10 Q 121190 1 Accumulator Oil Drain R 121197 1 Accumulator Oil Drain 12 34800 34801 Service Manual ORIGINAL 5 99 Display Definitions CH P Less than 24 psi at the inlet of the machine OIL Time to change the vacuum pump oil To reset CL L The low side clearing routine is in progress press MODE and ENTER at the same time while CON The vacuum pump runs continuously OIL is displayed CPL The specified cycle function recovery evacua SCAL The scale is damaged disconnected out of tion charging or adding refrigerant is complete calibration or overloaded It cannot exceed 45 FIL The filter drier change is in progress Pounds total weight U HI There is positive pressure on the vacuum pump Press MODE then RECOVER to remove the pr
17. a separate recovery unit 6 Open both manifold valves on the hand held manifold gauge set 7 11 Plug in the separate recovery unit and start its recovery process When the hand held gauge set shows 0 psi stop the recovery process Wait 10 minutes and watch the hand held manifold gauges for a pressure rise above zero Repeat steps 7 and 8 until positive pressure does not develop on the hand held gauge set Disconnect the blue 36 liquid and red 36 vapor hoses from the hand held manifold gauge set Close the high side manifold valve on the control panel of the 34800 34801 AC900 Disconnect the red 96 hose from the back of the unit Connect the yellow 36 air purge hose to the low side blue handle of a hand held manifold gauge set Connect a hose from the high side port of the machine to the high side of the hand held manifold gauge set Connect the hose from the center port of the hand held manifold set to the inlet of the separate recovery unit Open both the high and low side gauge valves on the control panel of the 34800 34801 AC900 and the hand held gauge set Start the recovery process on the separate recovery unit When the pressure on the hand held gauge set shows 0 psi stop the recovery process Wait 10 minutes and watch the hand held manifold gauges for a pressure rise above zero Repeat Steps 12 and 13 until positive pressure does not develop on the hand held gauge set Always wear s
18. afety goggles when working with refrigerants Contact with refrigerant can cause eye injury Disconnect lines and hoses with extreme caution Pressurized refrigerant may be present in lines and hoses Always point lines and hoses away from you and anyone nearb Always unplug the station from the power source before removing any of the shrouding or beginning any service work To order parts please FAX your order to 1 800 222 7805 All service related questions should be directed to Robinair at 1 800 822 5561 34800 34801 Service Manual ORIGINAL 5 99 10 Component Descriptions 18190A R 134a Low Side Coupler blue actuator smaller LD Allows access to the low side of an R 134a system e RA19115 Coupler Repair Kit front O ring only 18191A R 134a High Side Coupler red actuator larger LD Allows access to the high side of an R 134a system e RA19115 Coupler Repair Kit front O ring only 62096 R 134a Low Side Hose Provides flow from the low side coupler to the low side port on the station 14mm x 4 Acme e 17772 Hose to Coupler O ring 63096 R 134a High Side Hose Provides flow from the high side coupler to the high side port on the station 14mm x 12 Acme e 17772 Hose to Coupler O ring 68296A R 12 96 Blue Quick Seal Hose Low side service hose to the vehicle e 18180 Replacement R 12 Quick Seal O ring e 18451 45 4 Flare Quick Seal Repair Kit 68396A R 12 96
19. ch NOTE If the unit is just being turned on the screen defaults to display the selected refrigerant type Press MODE until the program message is displayed 3 Press the MODE and ENTER keys simultaneously to enter the DIAGNOSTIC mode Use the UP and DOWN keys to toggle the display to F09 4 Press the ENTER key The display now reads CAL 5 Press the RECOVER and VAC RECYCLE keys simultaneously The display flashes DATE and then shows 0 00 6 Using the UP and DOWN keys enter the current month and year For example if the unit is being calibrated in August of 1999 enter 0 8 9 9 Press ENTER 7 The display flashes r12 then displays ZEro zero 8 Make sure nothing is on or touching the R 12 scale platform Press ENTER 9 The display flashes A1 then displays 0 00 10 Place a certified weight between 10 and 40 Ibs in the center of the scale platform Using the UP and DOWN keys toggle to that weight on the display Press ENTER 11 The display flashes 134A then displays ZEro zero 12 The display flashes A1 then read 0 00 13 Place a certified weight between 10 and 40 pounds in the center of the scale platform Using the UP and DOWN keys toggle to that weight on the display then press ENTER The display then shows the selected refrigerant type 14 Check the scale accuracy SETTING THE P 1 POT 1 Remove all weight from the scale platforms 2 Turn on the MAIN POWER switc
20. e relay If there is not voltage replace the main board Manual Override Ear Pulled In 1 check for proper voltage from the power supply contact to ground If there is no voltage check the voltage supply source 2 check for proper voltage from the mating supply contact to ground If there is no voltage replace the relay NOTE Use of improper extension cord size can damage contact points acuum SWITCH amp RELAY 14 34800 34801 Service Manual ORIGINAL 5 99 Component Specifications RA18752 Vacuum Sensor The vacuum sensor is a normally closed sensor If a 13 2 Hg rating is reached at the intake the switch opens and breaks the coil contacts shutting off the unit The con tacts are closed when a vacuum above 13 Hg is present in the lower cavity When a 13 Hg vacuum is achieved in the lower cavity the spring contact has room to force away from the mating contact TROUBLESHOOTING With pressure in the accumulator open the oil drain valve to be sure pressure is present the switch should have con tinuity If it does not replace the switch If the unit is shutting off before reaching a 13 Hg vacuum check the inlet for obstructions before replacing the switch RA19427 High Pressure Cutout The high pressure cutout is a normally closed sensor de signed to shut the unit off if the discharge pressure reaches 435 psi Pressure is detected through the orifice i
21. e unit s control panel and press RECOVER Allow the unit to recover until it automatically shuts off CHARGING AND SCALE CHECK 1 Turn on the MAIN POWER switch 2 Check the scale accuracy and recalibrate if necessary See Scale Section for detailed instructions 3 Install the high and low side hoses to the vapor and liquid valves of a separate reusable cylinder 4 Program a two pound charge into the main board 5 Open both manifold gauge valves and start the automatic charging process The charging process stops when the programmed amount of weight has been lost from the scale The display shows the CPL message 6 Recover the refrigerant charged into the tank 7 Repeat full function test for the other refrigerant type as necessary NOTE To ensure a complete charge recycle for at least five minutes before attempting to charge During this process the refrigerant is heated in the recovery tank Labor Rates Robinair authorizes a 2 hour charge to troubleshoot and complete a full function test on units that are covered under factory warranty This includes leak testing The authorized time for parts replacement is 15 minutes per part If repairs are estimated to exceed 3 hours prior authorization from Robinair is required Filters are considered to be a consumable item and as such they are not covered under the factory warranty This includes parts and labor 30
22. er for flow obstructions and check for leaks around the gasket area If the equalization solenoid is receiving power replace the circuit board Check the compressor discharge and suction pressure If the unit is being run through an extension cord eliminate its use Remove the shroud and look for loose wires Check for voltage to the coil of the compressor replay energized If there is no voltage check the wires fromt he main board to the compressor relay for continuity If they have continuity replace the main board If the compressor relay is energized receiving 110 220 volts check for voltage from the 4 contact to ground with a volt meter it should be 110 220 volts If there is no voltage replace the compressor relay 5 Check for voltage to the compressor If there is no voltage check the wires between the compressor and the compressor relay for continuity Repair or replace as necessary If voltage is present at the compressor jumper the thermal overload If the compressor runs check the compressor amp draw If it is drawing higher than 6 amps or not running replace the compressor If the compressor is cool and drawing low amperage replace the thermal overload ORIGINAL 5 99 34800 34801 Service Manual Troubleshooting UNIT WILL NOT START I OR COMPLETE RECOVERY 2 6 Check to be sure both tank valves are open Check the tank pressure It should not exceed 300
23. essure Continue the evacuation procedure FULL The refrigerant recovery tank is full HI P Internal pressure in unit is above 435 psi Control Panel Components wi LR CLOSE VALVES WHEN OPERATING VEHICLE 5 CLOSE VALVES WHEN OPERATING VEHICLE Recovery n Recharge INST0546 13 RA19393 Mac Tools RA19402 R 134a High Side 42 RA19343 Main Power Switch Gauge 44 117684 Refrigerant Selector Switch 14 RA19392 Mac Tools RA19403 R 134a Low Side Gauge 53 RA19561 RA19562 AC900 Keypad 15 RA19393 Mac Tools RA19400 R 12 High Side Gauge 16 RA19392 Mac Tools RA19401 R 12 Low Side Gauge ORIGINAL 5 99 34800 34801 Service Manual Relay Specifications RA17459 RA17324 220 volt System Relays The system relay is used to energize the compressor or the vacuum pump and allow the sensors to shut the unit off The relay has two sets of contacts which close when the coil is energized Coil contacts 0 and 1 when energized should have 110 volts across the terminals While voltage is applied the coils forms a magnetic field pulling the 2 and 4 and the 6 and 8 contacts together The 2 and 4 and the 6 and 8 contacts have power supplied to one terminal of the pair When the coil is energized and supplies power to the mating component Troubleshooting Manual Override Ear Not Pulled In 1 Check the proper voltage to the O and 1 contacts If there is voltage replace th
24. h NOTE If the unit is just being turned on the screen will default to display the selected refrigerant type Press MODE until the program message is displayed 3 Press the MODE and ENTER keys simultaneously to enter Diagnostic Mode Use the UP and DOWN keys to toggle the display to F02 4 Press the ENTER key The screen will display 000 NOTE The zero on the left of the display is for R 12 and the zero on the right of the display is for R 134A Since the AC900 uses two 30 Ib tanks the full limit should be set at 43 Ibs 5 Place a known weight of 43 Ibs on the R 12 scale The zero on the left of the display should change to a 1 The display should be reading 100 At this point adjust the R 12 P 1 pot so the full limit is set at 43 Ibs Turning the P 1 pot clockwise will decrease the amount of weight you can put on the scale before the zero changes to a 1 which indicates the full limit has been reached Turning the P 1 pot counterclockwise will increase the amount of weight allowed before the zero changes to a 1 indicating that the full limit has been reached 6 Repeat step 5 on the 134A scale NOTE The zero on the right of the display indicates the 134A full limit Once the 134A full limit is reached the display reads 001 25 ORIGINAL 5 99 34800 34801 Service Manual Diagnostic Procedures 34800 and 34801 All diagnostic modes mentioned here are accessed by e
25. h allows you to select which tank to use 8 Unused Function Returns unit to normal operation 9 Gateway to Deep Diagnostics Display shows four dashed lines which prompt entry of coded special functions These functions directly affect large portions of the unit s operation 27 ORIGINAL 5 99 34800 34801 Service Manual Deep Diagnostic Functions NOTE Pressing the RESET key has no effect on any of these functions SCALE CALIBRATION The display briefly shows DATE then 0 00 Enter the date in the following format MM YY press ENTER to accept the entry The display now briefly shows r12 followed by ZEro Make sure there is no weight on the R12 scale and press ENTER The display now shows A1 and then 0 00 Place a known weight on the R12 scale and enter the value of the weight Press ENTER to accept The display now briefly shows 134a then shows ZEro Make sure there is no weight on the R 134a scale and press ENTER The display now briefly shows A1 then 0 00 Place a known weight on the R 134a scale and enter the value of the weight Press ENTER to accept The unit updates its programming and returns to normal operation 3 UL CIRCUIT ADJUSTMENT P1 pot The P1 pots on the 34800 are located on the front of the circuit board The pot on the left is for the R 12 scale and the pot on the right is for the R 134a scale Turning the pot counter clockwise increases the full limit Turning the pot clockwise decreases the full limit
26. her than Recovery RA19258 Recycling Solenoid Rebuild Kit A normally closed solenoid that prevents the flow of refrigerant into the system oil separator when the unit is notin Recycling Mode ORIGINAL 5 99 34800 34801 Service Manual 23 24 25 26 27 28 29 30 31 Component Descriptions continued RA19258 Charging Solenoid Rebuild Kit A normally closed solenoid preventing flow into the A C system when the unit is turned off or in any mode other than Charging RA19258 Vacuum Solenoid Rebuild Kit A normally closed solenoid designed to prevent flow to the vacuum pump during Recovery or Charging RA15425 RA15428 220 volt Vacuum Pump A 6 CFM two stage rotary vane pump designed to pull moisture and air from an A C system e 120165 Vacuum Tubing System Oil Separator Performs three functions Internal heat evaporates the saturated vapor preventing liquid from entering the compressor Any oil droplets contained in the refrigerant drop out in the separator The system oil separator s third function is that it acts as a heat exchanger e RA19480 Manifold O Ring Kit RA19291 Oil Drain Valve Allows the oil removed from the system to be drained when Recovery is complete The same amount of oil should be returned during charging e RA17419 Oil Drain Bottle 34724 Spin on Filter Drier Removes moisture acid and oil from the refrigerant 40084 Replacement
27. low Diagram Components 18190A R 134a Low Side Coupler blue actuator smaller LD 18191A R 134a High Side Coupler red actuator larger LD e RA19115 Coupler Repair Kit front O ring only 62096 R 134a Low Side Hose e 17772 Hose to Coupler O ring 63096 R 134a High Side Hose e 17772 Hose to Coupler O ring 68296A R 12 96 Blue Quick Seal Hose e 18180 Replacement R 12 Quick Seal O ring e 18451 450 14 Flare Quick Seal Repair Kit 68396A R 12 96 Red Quick Seal Hose e 18180 Replacement R 12 Quick Seal O ring e 18451 450 14 Flare Quick Seal Repair Kit 68126 36 Red R 134a Tank Hose e 17773 Replacement R 134a Quick Seal O ring e 40302 R 134a Quick Seal Repair Kit 68127 36 Blue R 134a Tank Hose e 17773 Replacement R 134a Quick Seal O ring e 40302 R 134a Quick Seal Repair Kit 68128 36 Yellow R 134a Tank Hose e 17773 Replacement R 134a Quick Seal O ring e 40302 R 134a Quick Seal Repair Kit 68121A 36 Red R 12 Tank Hose e 18180 Replacement R 12 Quick Seal O ring e 18451 450 14 Flare Quick Seal Repair Kit 68122A 36 Blue R 12 Tank Hose e 18180 Replacement R 12 Quick Seal O ring e 18451 450 1 4 Flare Quick Seal Repair Kit 68123A 36 Yellow R 12 Tank Hose e 18180 Replacement R 12 Quick Seal O ring e 18451 450 1 4 Flare Quick Seal Repair Kit RA19393 RA19402 MacTools R 134a High Side Gauge e 11715 Replacement Gauge Lens RA19392 RA19403 MacTo
28. ltage is okay go to step six If there is a problem with the voltage replace the main board Close the high side valve start the engine and pull in the remaining charge on the low side of the system When the remaining charge has been pulled from the tank the charging solenoid closes preventing a possible overcharge 23 ORIGINAL 5 99 34800 34801 Service Manual Diagnostic Procedures AC900 Press MODE and ENTER simultaneously to enter diagnostics Use the UP and DOWN keys to select the mode and press ENTER to start the mode F00 LB KG mode select F01 Diagnostic Vacuum F02 UL Circuit Adjustment F03 Filter Weight F04 Audit Trail F05 Segment Test F06 Calibration Test F07 Refrigerant Weight F08 Step Test Input Codes F09 Scale Calibration F10 Default Codes F11 F99 ENTER toggles between modes MODE locks the chosen mode Vacuum only Mode switch may be changed between R 12 and R 134a in this mode and a vacuum is pulled on the chosen side Setting the P1 pots Displays weight recovered through the filter on whichever side R 12 or R 134a is selected Mode switch may be changed between R 12 and R 134a without exiting allowing both filter weights to be checked Press RECOVER and RECYCLE ONLY to reset Displays date and number of scale calibrations Press RECOVER and RECYCLE ONLY keys simultaneously to set the number of calibrations to 001 Lights all segments of the L
29. n the base of the sensor In the normal setting less than 435 psi on orifice the 1 and 3 contacts are closed When 435 psi is introduced to the orifice the pressure forces up on the drive pin which forces the center contact to disengage the 1 and 3 contact and engage the and 2 contacts When this takes place the unit shuts off and the display reads HI P RA19429 Vacuum Pump Protection Switch The vacuum pump protection switch is a normally open sen sor If a 25 psi 2 psi rating is reached at the intake the switch closes sending a signal to the main board The contacts are closed when anything greater then 25 psi is present in the lower cavity When 25 psi is achieved in the lower cavity the spring contact is forced into the mating contact ORIGINAL 5 99 34800 34801 Service Manual Compressor Specifications and Service ELECTRICA LAPS COMPRESSOR SPECIFICATIONS Type 1 3 hp hermetic piston type compressor Oil Capacity 10 ounces 296 milliliters Oil Type 150 viscosity POE refrigeration oil Voltage 100 110V iunits use a RA 19458 220V units use a RA19457 Amperage 4 6 running amperage 100 110V 20 25 locked rotor amperage 3 4 5 running amperage 220V 16 19 locked rotor amperage CHECKING THE OIL 1 Depressurize the unit 2 Remove the compressor from the unit and place on a flat surface 3 Tilt the compressor 30 degrees see figure above At this angle the
30. ng 110 220 volts go to Step seven If the wires have continuity replace the main board If the solenoid is receiving 110 220 volts remove the air purge device Rebuild or replace as necessary Verify that the tank s liquid valve is open Verify that the manifold valves are completely open and unobstructed Inspect the liquid hose for proper installation on the tank and check for crushed hose gaskets Verify that the main board has accepted the program Remove the shroud and look for loose wires If the main board does not accept the program replace it Be sure the keypad is sending a program signal before replacing If the keypad is sending a signal an audible tone sounds when keys are pressed Check the voltage at the charging solenoid If there is no voltage check the lead wires for continuity If the wires have continuity replace the main board If there is proper voltage to the solenoid replace the solenoid 22 34800 34801 Service Manual ORIGINAL 5 99 Troubleshooting UNIT WILL NOT CHARGE PRESSURE ON GAUGES Verify that the unit is gaining access to the A C system Be sure there is a minimum of six pounds of refrigerant in the tank Be sure the scale is able to move freely Verify that the unit is charging through both the high and low side hoses Check for proper voltage to the charging solenoid not an erratic voltage drop If the vo
31. nt to be recycled at a later time The tank has two valves the vapor valve is an open fitting to the tankand the liquid valve has a draw tube extending to within 2 inches of the bottom of the tank 34705 R 134a Recovery Tank Stores refrigerant to be recycled at a later time The tank has two valves the vapor valve is an open fitting to the tank and the liquid valve has a draw tube extending to within 2 inches of the bottom of the tank 34800 34801 Service Manual ORIGINAL 5 99 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Component Descriptions continued 120034 Oil Injector Assembly Controls the flow of oil from the injection bottle to the vehicle e 113025 Oil Injector Check Valve e RA19141 Oil Bottle e RA19478 Replacement Valve RA19303 110V RA19294 220V RA19097 230V Power Cord Conducts power to the unit RA19047 Vacuum Pump Outlet Female socket where the vacuum pump power cord connects RA19343 Main Power Switch Controls the power between the power cord and the main board RA17416 RA17516 220 volt Fan Runs as soon as the MAIN POWER switch is turned on to cool the cabinet temperature 117684 Refrigerant Selector Switch Indicates which refrigerant type the machine is set up for RA19564 110V RA19618 220V RA19560 MacTools Main Board Controls the unit s functions automatic or programmed RA19445 Scale Assembly
32. ntering the diagnostic functions menu Press the SHIFT and ENTER keys simultaneously The unit s display prompts you for the function to run by displaying FUNC Unless otherwise noted pressing RESET accepts the current settings and returns the unit to normal operation STANDARD FUNCTIONS 0 LBS OR KG MODE SELECTION 1 Diagnostic Vacuum 2 Add Refrigerant 3 Accumulated Filter Weight 4 Audit Trail 5 Segment Test ENTER toggles the current mode The current mode is displayed by either the lbs or the kg segments The refrigerant mode switch selects which side of the unit to pull a diagnostic vacuum on To exit from this routine look for the U HI message or press HOLD From either of these two states a RESET returns the unit to normal operation The current refrigerant mode is assumed The process begins immediately upon the start of this function Therefore the liquid hose must already be disconnected from the correct tank and attached to the reserve tank that is being added from The display shows ADD briefly and then the amount of refrigerant transferred by weight The function continues the transfer until one of the following occurs HOLD is pressed the reserve tank is empty and pulled to a partial vacuum or the maximum fill weight of the function has been reached Under the last two conditions the display flashes between CPL and the amount of refrigerant transferred by weight In the HOLD condition pressing HOLD
33. ols R 134a Low Side Gauge e 11715 Replacement Gauge Lens RA19393 234 R 12 High Side Gauge RA19400 MacTools e 11715 Replacement Gauge Lens 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 43 47 RA19392 234 R 12 Low Side Gauge RA19401 Mac Tools e 11715 Replacement Gauge Lens 121238 R 134a High and Low Side Manifold Valves 121239 R 12 High and Low Side Manifold Valves RA19429 Vacuum Pump Protection Switch RA18752 Vacuum Sensor RA19258 Recovery Solenoid RA19258 Recycling Solenoid RA19258 Charging Solenoid RA19258 Vacuum Solenoid RA15425 RA15428 220 volt Vacuum Pump System Oil Separator RA19291 Oil Drain Valve 34724 Spin on Filter Drier RA19458 RA19457 220 volt Compressor Compressor Oil Separator RA19258 Equalization Solenoid RA19427 High Pressure Cutout RA19326 Recovery Check Valve RA19430 Expansion Valve RA19477 RA19616 220v R 134a Air Purge RA19476 RA19623 220v R 12 Air Purge 17105 R 12 Recovery Tank 34705 R 134a Recovery Tank 120034 Oil Injector Assembly RA17416 RA17516 220v Fan RA19445 Scale Assembly 34800 34801 Service Manual ORIGINAL 5 99 Flow Diagram E K O R 134a ORIGINAL 5 99 34800 34801 Service Manual Pictorial View of Front H va J Jo o e D
34. re should be oil in the suction fitting ADDING OIL 1 Install a funnel in the suction fitting and pour two ounces of oil into the funnel 2 Start the compressor momentarily Plug the intake fitting but leave the discharge fitting open The compressor will pull oil from the funnel Stop the compressor 3 Check the oil level If it is still low add 2 ounces at a time until a proper level is achieved Blue White R 134a Blue Black R 12 Blue White R 134a Blue Black R 12 Brown White F134 town Nene R 194a Brown White R 134a Brown Black R 12 rown Blacl Brown Black R 12 Suction and Discharge Pressure Test 1 Disconnect all fittings from the unit 2 Cap the intake fitting 3 Install a low side gauge on the suction fitting NOTE The fittings used on these compressors require an O ring fitting to seal and a 120063 hose 1 4 flare o ring X 1 2 Acme Q S with an R 134a manifold set 4 Verify that the discharge fitting is unobstructed 5 Start the compressor and monitor the suction readings The compressor should pull a 25 Hg 85 bar vacuum If the compressor has weak suction check the oil level and add if necessary If the oil level is okay or oil was added with no improvement replace the compressor 6 Disconnect the low side gauge on the discharge fitting I Install a high pressure gauge on the discharge fitting NOTE The fittings used on these compressors require an O ring fit
35. s tiennent 26 Deep Diagnostic Functions 000 eeceeeceeceesceeeeeeseeeeeeecneeeeeenees 28 Function TEST tent een done dessin e 29 ORIGINAL 5 99 34800 34801 Service Manual Theory of Operation and Safety Precautions The Series 34800 34801 AC900 recovery recycling evacuation and recharging units are designed for R 12 and R 134a refrigerants only These units are UL approved and meet SAE J 1770 standards These units began production in March of 1999 for AC900 made prior to this date refer to previous AC900 service manual The model serial number and manufacturing date code can be found on a white tag located on the back of the unit above the tank DEPRESSURIZING THE UNIT NOTE Since the series 34800 34801 AC900 has separate components for each refrigerant type it is only necessary to depressurize the side in need of repairs For this process you will need a separate hand held manifold set 1 Close both the blue liquid and red vapor valves on the 30 pound recovery tank 2 Disconnect all hoses from the 30 pound recovery tank 3 Disconnect the red high side and blue low side hoses from a hand held manifold gauge set 4 Connect the blue 36 liquid hose to the low side blue handle of the hand held manifold gauge set Connect the red 36 vapor hose to the high side red handle of the manifold gauge set 5 Connect the yellow hose attached to the center port of the hand held manifold gauge set to the inlet of
36. the low side hose coupler from a separate hand held manifold gauge set to the service port Verify that the valves are closed on the hand held manifold gauge set Program a 20 minute vacuum into the main board and start the automatic vacuum process The vacuum pump starts Verify that the low side manifold valve on the unit s control panel is open The low side gauge on the unit starts registering a vacuum Within 10 seconds of the vacuum pump starting the RECYCLE prompt appears on the display and a click is heard The compressor is starting and the recycling solenoid is being energized After 60 seconds of recycling the air purge solenoid receives 110 220 volts to open it If air is being purged the solenoid is getting 110 220 volts In some cases no air is present and the voltage needs to be checked to verify the solenoid operation After 5 minutes the low side gauge on the unit s control panel is in a 29 to 30 Hg vacuum The low side gauge on the hand held manifold gauge set rises to around a 30 to 40 psi reading expansion valve pressure If the expansion valve setting is not in range adjust accordingly The low side manifold gauge on the unit s control panel should hold a vacuum If it does not inspect the hoses for leaks Close the tank s red vapor valve Disconnect the tank s red vapor hose from the tank Using a separate manifold gauge set verify that the manifold gauge
37. the recycle solenoid The compressor continues to run until the Accum Oil separator and the filter reach a 13 vacuum pi Check that all recovery tank hoses are properly installed N Verify that the recovery tank valves are completely open LA Be sure there is a minimum of 10 pounds of refrigerant in the tank 4 Install the low side of a manifold gauge set to the oil drain un If positive pressure is present at the service port remove the cover and look for loose wires to the vacuum sensor If there are no loose wires check for continuity on the vacuum sensor If there is none replace the vacuum sensor fon Inspect the orange wires between the main board and the vacuum sensor for continuity If the wires and the vacuum sensor have continuity jumper the orange wires together Start recycling if the service port is being pulled into a vacuum Look for loose wires to the recycling solenoid and verify that 110 volts is being sent to the recycling solenoid If there is no voltage inspect the controlling wires for continuity Replace the main board if the wires have continuity CO Verify that you have flow through the blue tank hose and the moisture indicator Replace and clean as necessary VM If the hose or moisture indicator is not plugged attempt to recalibrate the expansion valve If you are unable to recalibrate the expansion valve rebuild the recycling solenoid and replace the
38. ting to seal and a 120063 hose 1 4 flare o ring X 1 2 Acme Q S with an R 134a manifold set 8 Verify that the intake fitting is unobstructed 9 Start the compressor and monitor the pressure for about 4 minutes If pressure doesn t reach at least 350 psi 24 bar replace the compressor 16 34800 34801 Service Manual ORIGINAL 5 99 Troubleshooting UNIT WILL NOT COME OUT OF CL L S COMPRESSOR RUNS WILL NOT RECOVER 2 UNIT WILL NOT COME OUT OF CL L I COMPRESSOR IS OFF WILL NOT RECOVER If the unit is being run through an extension cord eliminate its use Disconnect the high and low side hose from the vehicle with the gauge valves open If the pressure on the gauges drops while the display shows CL L the recovery solenoid may need to be replaced or rebuilt Check the oil drain valve Verify that it is closed and not bleeding through Install the low side hose on the oil drain with the low side valve closed Check the gauge If it has positive pressure go to Step 5 If psi is below a 20 Hg vacuum test the vacuum sensor for continuity If there is continuity replace the sensor If there is no continuity check the vacuum sensor wires for continuity If the wires have continuity replace the main board Close the tank s liquid valve If pressure starts dropping on the gauge and the unit starts a recovery sequence clean and rebuild the recycling solenoid Inspect the filt
39. valves are closed Connect the tank s red vapor hose to the high side of the separate manifold gauge set Connect the hose from the center port of the hand held manifold gauge set to the tank s vapor fitting 29 ORIGINAL 5 99 34800 34801 Service Manual 17 18 19 20 23 24 25 26 27 28 Open the tank s red vapor valve Do not open the red high side valve on the hand held manifold gauge set Use the RECYCLE ONLY function The unit begins recycling and the high side manifold gauge starts increasing pressure The unit shuts off when the high side manifold gauge shows a pressure of 435 psi 20 psi The display shows the HI P message There is an initial drop in pressure to around 275 300 psi After the initial drop in pressure the pressure should hold for 3 minutes If the pressure drops instantly or bleeds off steadily the recovery check valve needs to be replaced After checking for pressure loss slowly open the high side manifold valve to equalize the unit and tank pressure Once the pressure is equalized close the tank s red vapor valve Close the high side manifold valve and disconnect at the tank end the hose between the tank s red vapor valve and the manifold gauge set Disconnect the tank s red vapor hose from the manifold gauge set Reconnect the tank s red vapor hose to the tank s red vapor valve Open both manifold gauge valves on th
40. w pressure saturated vapor The calibration of the expansion valve can be checked at the oil drain with a pressure gauge The allowable tolerance of the valve is 30 to 40 psi during Recycling NOTE Allow the unit to recycle 10 minutes with a minimum of 10 pounds of refrigerant in the tank before checking or adjusting the pressure 35 36 37 38 RA19477 110V RA19616 220V R 134a Air Purge Device After the recycling sequence has run for 30 seconds a timer programmed in the main board opens the normally closed solenoid of the selected refrigerant type allowing pressure to enter the lower cavity of the air purge device When pressure on the lower cavity exceeds pressure on the upper cavity by 7 psi or more a valve inside the device opens to release the air pressure from the cavity When the pressures come within 3 psi of each other the device stops purging RA19476 RA19623 220V R 12 Air Purge Device After the recycling sequence has run for 30 seconds a timer programmed in the main board opens the normally closed solenoid of the selected refrigerant type allowing pressure to enter the lower cavity of the air purge device When pressure on the lower cavity exceeds pressure on the upper cavity by 7 psi or more a valve inside the device opens to release the air pressure from the cavity When the pressures come within 3 psi of each other the device stops purging 17105 R 12 Recovery Tank Stores refrigera
41. y does not respond to keypad commands verify that the keypad is plugged in If the keypad is plugged in but not responding replace the keypad If the keypad is functional a tone sounds when a key is pressed Display Reads Scale 1 Check the scale calibration and P1 pot adjustments Recalibrate and adjust as necessary Refer to function check for detailed instructions 2 Check the scale cable to be sure it is connected to the main board 3 Disconnect the scale cable from the main board and jumper the white and black leads If the display still reads Scale replace the main board If the display clears the message Scale replace the scale ORIGINAL 5 99 34800 34801 Service Manual Troubleshooting UNIT WILL NOT EVACUATE 1 Verify that the manifold gauge valves are open PUMP IS RUNNING 2 Verify that the high and low side hoses couplers are tight at all fittings 3 Check the oil injector tubing for leaks and loose connections 4 Be sure the vacuum hose is snug at both ends and not obstructed Check the hose gaskets for leaks 5 Check for suction at the intake of the pump If there is none replace the pump 6 Remove the shroud and look for loose wires to the vacuum solenoid 7 Check for voltage to the vacuum solenoid If voltage is present rebuild the solenoid or inspect for debris 8 If no voltage is present check the lead wires for continuity If continuity is present replace the main
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